Delphinium plants (high magnification of a seed shown here), commonly known as larkspur, derive their name from the Latin for “dolphin,” referring to the shape of the flower’s nectar-producing glands. Larkspur is in fact very toxic to humans and is a significant cause of cattle poisoning in the United States. Death occurs within a few hours of ingestion by blocking signaling between nerves and muscles. Image by Sahar Khodaverdi, University of Tabriz.